If she's happy, gaining weight, and having mostly yellow bms, it's probably fine. I think the foremilk/hindmilk issue is only when the green poos are also frothy and sometimes have blood. I would probably feed normally, off one side first and then offer the second, too. Both of my kiddos had the occasional green poo and it was no biggie. It could even be something you are eating (if you pump, you might notice your milk sometimes has a blue or green tint to it-totally normal!). If it happens a lot, she could could be having a sensitivity to what you are eating (dairy tends to be a big culprit), but since she isn't acting fussy I doubt that's what's going on.

If it becomes a problem then I'd consider block feeding. I actually did have to block feed DD because it became such an issue for us and also with the reflux. A green poo every now and then isn't going to hurt them.

My first son had this off and on the first few months, it never seemed to be too much of an issue for him. As long as she doesn't seem uncomfortable and is gaining weight normally, she's probably fine!